CN103069689B

CN103069689B - The detection device of metal foreign body of contactless power supply system and contactless power supply system

Info

Publication number: CN103069689B
Application number: CN201180041459.0A
Authority: CN
Inventors: 安倍秀明
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2010-06-30
Filing date: 2011-05-20
Publication date: 2016-07-13
Anticipated expiration: 2031-05-20
Also published as: CN103069689A; EP2590300A1; KR101568769B1; US9099239B2; JP2012016125A; EP2590300B1; TW201208225A; KR20130038885A; KR20150003408A; TWI459676B; US20130099592A1; EP2590300A4; WO2012002063A1

Abstract

A kind of detection device of metal foreign body (7) of contactless power supply system, including: aerial coil (AT2)；Oscillating circuit (7a), it makes have high frequency electric to flow in aerial coil；And testing circuit (7b), the change of its voltage to being observed in any one of oscillating circuit and aerial coil or electric current detects.Oscillating circuit (7a) includes the building block being set to following design load: this design load makes oscillating circuit to produce vibration from immediately preceding the oscillating condition starting to produce in the scope to before stable condition of sustained oscillation of the oscillating condition after vibrating.Detection device of metal foreign body (7) utilizes testing circuit (7b), the change of the electrical characteristic according to the aerial coil (AT2) caused by the metallic foreign body being placed on electric supply installation (1), the stopping of vibration or the decay of amplitude of oscillation to oscillating circuit (7a) detect.

Description

The detection device of metal foreign body of contactless power supply system and contactless power supply system

Technical field

The present invention relates to the detection device of metal foreign body of a kind of contactless power supply system and contactless power supply system.

Background technology

In order to portable phone, household electrical appliance etc. are carried out non-contact power, mostly utilize the electromagnetic induction produced by the magnetic flux of high frequency.The electromagnetic induction being not only the contiguous being actually applied is powered, and concerned being referred to as in the space power supply technique being powered with the distance being separated by a certain degree of magnetic resonance also utilizes identical electromagnetic induction always in recent years.

The magnetic flux of high frequency also makes metallic foreign body produce induction electromotive force, causes that due to eddy-current loss temperature rises.When metallic foreign body becomes high temperature, it is possible to cause electric supply installation, the housing of equipment deforms, or scalds when people contacts by mistake.

Propose the various invention (such as, patent documentation 1 and patent documentation 2) for preventing from this metal is carried out sensing heating.In these proposed systems, the high frequency inverter circuit of electric supply installation side intermittently vibrates, standby.Even if the individually placed metallic foreign body when this is standby, minimum owing on average exporting, therefore also there's almost no temperature and rise, be safe.

When placed correct equipment, during this intermittent oscillation, transmit a little electric power via primary coil to secondary coil.Utilize this electric power to generate special signal in primary side (equipment side), via the antenna of electric supply installation side, this signal is sent back to.By detecting this signal, electric supply installation judges whether that the equipment being mounted with standard controls high-frequency inverter.

That is, electric supply installation is made whether the certification into correct equipment, and therefore still keeping intermittent oscillation when only placed metallic foreign body should be safe.

Patent documentation 1: No. 3392103 publications of Japan Patent

Patent documentation 2: No. 3306675 publications of Japan Patent

Summary of the invention

The problem that invention to solve

But, in the detection device of metal foreign body that contactless power supply device uses, detection when certainly can carry out metallic foreign body individually placed, but it is sandwiched in the foil etc. of electric power primary coil and the gap of electric power secondary coil when cannot detect use.

As the method that this metal being clipped between coil is detected, consider following methods: when sending between power supply section and equipment, receiving signal, the metal owing to being pressed from both sides occurs that the level decaying or reflecting and be sent to from sending side the signal receiving side decline and detects.The method utilizes following structure to detect: when authenticating device, if metallic foreign body is between transmission/reception antennas, then compared with generally, the signal amplitude when the certification of reception antenna side is decayed.

Additionally, as the example to other method that this metallic foreign body pressed from both sides detects, consider following methods: directly use the power coil for electric power transmission and electricity reception coil, from equipment side, the output of electricity reception coil is modulated when data communication, thus causes voltage that the terminal place of the power transmission coil in electric supply installation side occurs or electric current to change.In the method, the signal attenuation of data communication when there is metallic foreign body between electricity reception coil and power transmission coil, therefore by utilizing this structure to detect the metal being sandwiched into.

But, in these methods, if metallic foreign body is little or thin, the decay of signal is little, therefore it is also possible to the deviation of signal level when being taken as being absent from foreign body and examine and do not measure metallic foreign body.Thus, the detection of the metallic foreign body pressed from both sides is restricted.

About electric supply installation in recent years, in order to tackle the equipment of high output, there is the tendency that the output change of per unit area is big, need all the more less foil is detected.Generally, must be provided with the metal detection sensor of high price, HIGH SENSITIVITY AND HIGH PRECISION special on a large scale to tackle this situation, cause that the maximization of electric power system, cost increase.

The present invention completes to solve the problems referred to above, its object is to provide a kind of can detect the contactless power supply system of metallic foreign body and the detection device of metal foreign body of contactless power supply system with cheap and simple structure with carrying out HIGH SENSITIVITY AND HIGH PRECISION.

For solving the scheme of problem

The 1st aspect of the present invention is a kind of contactless power supply system.This contactless power supply system possesses: electric supply installation, and it includes primary coil and makes the high-frequency inverter having high frequency electric to flow in above-mentioned primary coil；Equipment, it includes secondary coil, and the alternating magnetic field that this secondary coil is produced by the electric current owing to flowing in above-mentioned primary coil produces induction electromotive force, and load is provided electric power by the electromotive force that this equipment utilization produces in above-mentioned secondary coil；And detection device of metal foreign body, comprising: aerial coil；Oscillating circuit, it makes have high frequency electric to flow in above-mentioned aerial coil；And testing circuit, the change of its voltage to being observed in any one of above-mentioned oscillating circuit and above-mentioned aerial coil or electric current detects, wherein, above-mentioned oscillating circuit includes the building block with following design load: this design load makes above-mentioned oscillating circuit produce vibration under the oscillating condition started in this oscillating circuit in the scope to before stable condition of sustained oscillation of the oscillating condition after producing vibration, above-mentioned detection device of metal foreign body utilizes above-mentioned testing circuit, the change of the electrical characteristic according to the above-mentioned aerial coil caused by the metallic foreign body being placed on above-mentioned electric supply installation, the stopping of vibration or the decay of amplitude of oscillation to above-mentioned oscillating circuit detect, control above-mentioned electric supply installation.

The 2nd aspect of the present invention is the detection device of metal foreign body of this contactless power supply system a kind of, the primary coil of electric supply installation is carried out excitation by this contactless power supply system, the secondary coil being made the equipment being arranged on above-mentioned electric supply installation by electromagnetic induction produces induction electromotive force, and this induction electromotive force is supplied to the load of the said equipment.This detection device of metal foreign body possesses: aerial coil；Oscillating circuit, it makes have high frequency electric to flow in above-mentioned aerial coil；And testing circuit, the change of its voltage to being observed in any one of above-mentioned oscillating circuit and aerial coil portion or electric current detects, wherein, above-mentioned oscillating circuit includes the building block with following design load: this design load makes above-mentioned oscillating circuit produce vibration under the oscillating condition started in this oscillating circuit in the scope to before stable condition of sustained oscillation of the oscillating condition after producing vibration, the change according to the electrical characteristic of the above-mentioned aerial coil caused by the metallic foreign body being placed on above-mentioned electric supply installation of the above-mentioned testing circuit, the stopping of vibration or the decay of amplitude of oscillation to above-mentioned oscillating circuit detect, control above-mentioned electric supply installation.

The effect of invention

In accordance with the invention it is possible to detect metallic foreign body with cheap and simple structure HIGH SENSITIVITY AND HIGH PRECISION.

Accompanying drawing explanation

Fig. 1 is the overall perspective view of the electric supply installation of the first embodiment.

Fig. 2 indicates that the explanation figure of the allocation position of primary coil, metal detection aerial coil.

Fig. 3 indicates that the circuit block diagram of the electrical structure of electric supply installation and equipment.

Fig. 4 is the oscillating circuit figure of detection device of metal foreign body.

(a) of Fig. 5 indicates that what all the figure of state not placed to electric supply installation, b () indicates that the figure of the state that electric supply installation only placed sheet metal, c () indicates that the figure of the state that electric supply installation only placed equipment, d () indicates that the figure of the state having sandwiched sheet metal between the mounting surface and equipment of electric supply installation, (e) indicates that the figure of the state that placed sheet metal in the position away from equipment.

Fig. 6 is the output waveform figure of the oscillator signal of oscillating circuit.

Fig. 7 is the output waveform figure of the detection signal of the oscillating circuit under other oscillating condition.

Fig. 8 is the circuit diagram of high frequency inverter circuit.

Fig. 9 is the first excitation synchronizing signal and the output waveform figure of the second excitation synchronizing signal.

Figure 10 is the output waveform figure of high frequency inverter circuit.

Figure 11 is the output waveform figure of high frequency inverter circuit.

Figure 12 is the overall perspective view of the electric supply installation of the second embodiment.

Figure 13 indicates that the electric supply installation of the second embodiment and the circuit block diagram of the electrical structure of equipment.

Figure 14 indicates that the circuit of the electrical structure of the metal detection aerial coil of the second embodiment.

Figure 15 indicates that the circuit diagram of another example of the second embodiment.

Figure 16 is the overall perspective view of the electric supply installation of the 3rd embodiment and equipment.

Figure 17 indicates that the electric supply installation of the 3rd embodiment and the circuit block diagram of the electrical structure of equipment.

Figure 18 is the overall perspective view of the electric supply installation of the 4th embodiment and equipment.

Figure 19 indicates that the electric supply installation of the 4th embodiment and the circuit block diagram of the electrical structure of equipment.

(a) of Figure 20 indicates that what all the figure of state not placed to electric supply installation, b () indicates that the figure of the state that electric supply installation only placed sheet metal, c () indicates that the figure of the state that electric supply installation only placed equipment, d () indicates that the figure of the state having sandwiched sheet metal between the mounting surface and equipment of electric supply installation, e () indicates that the figure of the state that placed sheet metal in the position away from equipment, f () is that mounting surface and the equipment of electric supply installation is separated the figure of the state being powered, g mounting surface that () is electric supply installation is separated with sheet metal, also the figure of the state of sheet metal it is placed with in the space of this separation.

Figure 21 is the output waveform figure of the oscillator signal of oscillating circuit.

Figure 22 indicates that the axonometric chart of another example of detection device of metal foreign body.

Detailed description of the invention

Below, the first embodiment embodied by the contactless power supply system of the present invention is described according to accompanying drawing.

Fig. 1 illustrates electric supply installation 1 and the overall perspective view of the equipment E by this electric supply installation 1 non-contact power.The housing 2 of electric supply installation 1 by the base plate 3 of tetragon, extend upward from the surrounding of this base plate 3 and the top board 5 being made up of safety glass of the peristome of the tetragon framework 4 that formed and the top of closing this tetragon framework 4 is formed.And, the upper surface of top board 5 becomes the mounting surface 6 in the power supply face as mounting equipment E.

As in figure 2 it is shown, be equipped with primary coil L1 in the space (in housing 2) formed by base plate 3, tetragon framework 4 and top board 5.In the present embodiment, primary coil L1 is one, configures abreast with the mounting surface 6 of top board 5.And, primary coil L1 is configured to be fixed on and is close to, with the lower surface of top board 5, the position contacting this degree.

The base plate 3 of the lower position of primary coil L1 is installed and is configured with the supply module M controlled for primary coil L1 carries out excitation drive.Supply module M is connected with primary coil L1, and primary coil L1 is carried out excitation driving, and the equipment E being placed in mounting surface 6 is carried out non-contact power.

It addition, as in figure 2 it is shown, in the outside of primary coil L1, configure in the way of surrounding primary coil L1 and be fixed with signal receiving antenna loop A T1.And, it is being placed between the equipment E of mounting surface 6 and supply module M, is being carried out the transmission reception of data, information via signal receiving antenna loop A T1 by radio communication respectively.

It addition, as in figure 2 it is shown, at the upper surface (mounting surface 6) of top board 5 and be formed with metal detection aerial coil AT2 with primary coil L1 position in opposite directions.Metal detection aerial coil AT2 is formed as spiral-shaped, utilizes known printed wiring technology to be formed in mounting surface 6.

Metal detection aerial coil AT2 is connected with the detection device of metal foreign body 7 being arranged in housing 2, constitutes a part for detection device of metal foreign body 7.Detection device of metal foreign body 7 detects the sheet metal 8 in mounting surface 6 by metal detection aerial coil AT2.And, supply module M, when the sheet metal 8 detected in mounting surface 6, is exported metal and there is signal ST by detection device of metal foreign body 7.

It addition, be provided with the systems control division 9 being made up of pico computer that supply module M is uniformly controlled in housing 2.And, the data, the information that are received by signal receiving antenna loop A T1 are output to systems control division 9 via supply module M.It addition, there is signal ST and be output to systems control division 9 via supply module M in the metal by metal detection aerial coil AT2 detection and from detection device of metal foreign body 7 output.

The equipment E of the mounting surface 6 being placed in electric supply installation 1 has secondary coil L2.Powering as in figure 2 it is shown, the secondary coil L2 of equipment E is carried out excitation by the excitation of the primary coil L1 of electric supply installation 1, this electric power being powered, i.e. secondary power are provided the load Z of equipment E by the secondary coil L2 of equipment E.

It addition, as in figure 2 it is shown, the outside of secondary coil L2 at equipment E, be wound with transmission/reception antennas loop A T3 in the way of surrounding this secondary coil L2.And, when equipment E is placed in the mounting surface 6 of electric supply installation 1, equipment E is positioned at the signal receiving antenna loop A T1 of the primary coil L1 immediately below it via surrounding, and this primary coil L1 carries out being undertaken by radio communication between the supply module M that excitation driving controls the transmission reception of data, information.

Then, electric supply installation 1 and the electrical structure of equipment E are described according to Fig. 3.

In figure 3, equipment E possesses equipment side transmitter/receiver circuit 10.Equipment side transmitter/receiver circuit 10 is connected with transmission/reception antennas loop A T3.Equipment side transmitter/receiver circuit 10 generates device authentication signal ID and excitation request signal RQ, this device authentication signal ID represent it is accept the equipment E, this excitation request signal RQ of power supply for powering to electric supply installation 1 request by electric supply installation 1.And, this device authentication signal ID and excitation request signal RQ is sent to electric supply installation 1 via transmission/reception antennas loop A T3 by equipment side transmitter/receiver circuit 10.

At this, equipment E is the equipment being driven by the electric power (secondary power) produced in secondary coil L2, as long as can generate the said equipment authentication signal ID and excitation request signal RQ and be sent to the equipment of electric supply installation 1.Thus, equipment E can be following equipment: this equipment by the secondary power produced in secondary coil L2 by rectification circuit carry out rectification and use rectification to obtain DC source thus being driven in mounting surface 6, or can also be secondary power is directly used as alternating current power supply thus being driven in mounting surface 6.It addition, equipment E can also is that by rectification circuit the secondary power produced in secondary coil L2 carried out rectification and equipment that built-in rechargeable battery (secondary cell) is charged by the DC source that uses rectification to obtain.

Additionally, in the equipment E such as the portable phone for built-in secondary cell is charged, notebook personal computer, equipment side transmitter/receiver circuit 10 can also be made to possess following functions: when secondary cell charging complete, eliminate the excitation request signal RQ in the device authentication signal ID and excitation request signal RQ sent before charging complete, only send device authentication signal ID.

Additionally, in the equipment E possessing timer, equipment side transmitter/receiver circuit 10 can also be made to possess following functions: accept power supply and drive equipment E within the time set by timer, eliminating the excitation request signal RQ in the device authentication signal ID sent before the elapsed time and excitation request signal RQ when have passed through this set time, only sending device authentication signal ID.

On the other hand, in figure 3, the supply module M being connected to primary coil L1 possesses: excitation request receiving circuit 11, device authentication receive circuit 12, excitation control circuit 13 and high frequency inverter circuit 14.

Excitation request receiving circuit 11 is connected with the signal receiving antenna loop A T1 of supply module M, receives from the equipment E the being placed in mounting surface 6 transmission signal sent via signal receiving antenna loop A T1.Excitation request receiving circuit 11 sends, from what receive, the excitation request signal RQ extracted signal for asking power supply.Then, this excitation request signal RQ, when going out excitation request signal RQ from transmission signal extraction, is exported excitation control circuit 13 by excitation request receiving circuit 11.

Device authentication receives circuit 12 and is connected with the signal receiving antenna loop A T1 of supply module M, receives from the equipment E the being placed in mounting surface 6 transmission signal delivered letters via signal receiving antenna loop A T1.Device authentication receives circuit 12 and represents, from the signal extraction that sends received, the device authentication signal ID being able to accept the equipment E of power supply.Then, device authentication receives circuit 12 when going out device authentication signal ID from transmission signal extraction, and this device authentication signal ID is exported excitation control circuit 13.

It addition, excitation control circuit 13 is connected with detection device of metal foreign body 7.As shown in Figure 4, detection device of metal foreign body 7 possesses and makes the oscillating circuit 7a that high frequency electric flows to metal detection aerial coil AT2 and the testing circuit 7b that the voltage of metal detection aerial coil AT2 or the change of electric current (oscillator signal Vo) are detected.And, detection device of metal foreign body 7 detects whether be placed with sheet metal 8 in mounting surface 6 by metal detection aerial coil AT2, when detect in mounting surface 6, be placed with sheet metal 8 time, export metal from testing circuit 7b to excitation control circuit 13 and there is signal ST.

In the present embodiment, as shown in Figure 4, oscillating circuit 7a is made up of Colpitis oscillating circuit, and metal detection aerial coil AT2 is also used as one of inductance building block of this oscillating circuit 7a.

Oscillating circuit 7a includes bipolar transistor Q1, metal detection aerial coil AT2, the first～the 3rd capacitor C1～C3, first and second resistance R1, R2.

The collector terminal of transistor Q1 is connected with one end of metal detection aerial coil AT2, and the other end of this metal detection aerial coil AT2 is connected with the plus end of DC source B.It addition, the other end of metal detection aerial coil AT2 is connected via the emitter terminal of the first capacitor C1 and transistor Q1.Further, between the collector terminal of transistor Q1 and emitter terminal, the second capacitor C2 it is connected to.

It addition, the base terminal of transistor Q1 is connected with the plus end of DC source B via the parallel circuit being made up of the 3rd capacitor C3 and the first resistance R1.It addition, the emitter terminal of transistor Q1 is connected via the negative terminal of the second resistance R2 and DC source B.And, the oscillator signal Vo of oscillating circuit 7a is exported testing circuit 7b from the collector terminal of transistor Q1 by oscillating circuit 7a.

For the oscillating circuit 7a constituted like this, preset the circuit constant constituting the building block of this oscillating circuit 7a, i.e. transistor Q1, metal detection aerial coil AT2, the first～the 3rd capacitor C1～C3, first and second resistance R1, R2, export the oscillator signal Vo that can detect metallic foreign body in high sensitivity.

In detail, the building block constituting oscillating circuit 7a is set to following design load: this design load makes oscillating circuit 7a immediately preceding not producing the ultimate value of vibration during beyond driving this oscillating circuit 7a and starting generation vibration in the scope of the oscillating condition the state after producing vibration is stablized near the state at peak swing place stable for this oscillating circuit 7a to amplitude of oscillation.

That is, the design load of oscillating circuit 7a is not able to maintain the value of persistent oscillation with stable amplitude, and is set at values below: producing vibration under the oscillating condition in the scope before the oscillating condition that can start after vibrating to stable condition of sustained oscillation.As a result of which it is, the big change of the amplitude of oscillation of oscillator signal Vo can be generated with the little change of the electromagnetic parameter relevant to vibration.

In other words, the electrical characteristic of the metal detection aerial coil AT2 of oscillating circuit 7a is as being placed in the mounting surface 6 of electric supply installation 1 sheet metal 8 and change.And, utilize the change of the electrical characteristic of this metal detection aerial coil AT2 to make the vibration of oscillating circuit 7a stop or making the amplitude of oscillation of oscillator signal Vo significantly decay.

It addition, about the mounting surface 6 of electric supply installation 1, it is considered to the situation shown in (e) of (a) of Fig. 5～Fig. 5.

(a) of Fig. 5 be shown in the mounting surface 6 of electric supply installation 1 what all do not place state.

(b) of Fig. 5 is shown in the state that only placed sheet metal 8 in the mounting surface 6 of electric supply installation 1.

(c) of Fig. 5 is shown in the state that only placed equipment E in the mounting surface 6 of electric supply installation 1.

(d) of Fig. 5 is shown in the state having sandwiched sheet metal 8 between the mounting surface 6 of electric supply installation 1 and equipment E.

(e) of Fig. 5 is shown in the mounting surface 6 of electric supply installation 1 and placed the state of sheet metal 8 away from the position of equipment E.

Under this each state, when shown in (a) of Fig. 5 in mounting surface 6 what all do not have placement, as shown in the period A1 of Fig. 6, it is necessary to make the oscillator signal Vo of oscillating circuit 7a become peak swing waveform.Under this premise, when shown in (b) of Fig. 5, as shown in the period A3 of Fig. 6, needing the amplitude making oscillator signal Vo is zero, when shown in (c) of Fig. 5, as shown in the period A2 of Fig. 6, it is necessary to make oscillator signal Vo become the amplitude waveform that the peak swing of the state that beyond all else is not placed is slightly smaller.

Further, when shown in (d) of Fig. 5 and (e) of Fig. 5, as shown in the period A4 of Fig. 6, it is necessary to the amplitude making oscillator signal Vo is zero.

Therefore, in the present embodiment, as it has been described above, by changing the value of building block, kind the and wittingly design load of building block constituting oscillating circuit 7a being set as vibrate the value near the condition finally started, realize the oscillator signal Vo of oscillating circuit 7a.

Thus, in oscillating circuit 7a, when only placed equipment E, the amplitude of oscillator signal Vo is slightly decayed, on the other hand, only placed sheet metal 8 or between equipment E and mounting surface 6, sandwiching sheet metal 8 or stopping oscillation when being placed around sheet metal 8 at equipment E.

Between equipment E and metal detection aerial coil AT2, although sheet metal 8 becomes near with the distance of metal detection aerial coil AT2, even if being that the presence or absence of vibration is also impacted by a small amount of difference of this distance.

In other words, oscillating circuit 7a adjusts the distance to have highly sensitive sensor, even the proximity of the short distance of the thickness being placed on housing than equipment E or fit tightly such sheet metal 8, it is also possible to detect accurately.

And, when there is sheet metal 8, the equipment E with fixing thickness of shell can not fit tightly with metal detection aerial coil AT2, therefore, it is possible to clearly distinguish the equipment E in housing with secondary coil L2, metal and magnetic material and sheet metal 8 ground detects.

Result is, by the design load of oscillating circuit 7a is chosen as the value near the condition finally can vibrated, the change of electromagnetic property obtaining the sheet metal 8 of the proximity by the top being placed on metal detection aerial coil AT2 is caused has extremely highly sensitive state.

It addition, in actual circuit, the characteristic relevant with the inductance of the wiring causing high frequency mo, electric capacity, the amplification of transistor that uses intricately is entrained in above-mentioned oscillating condition.Therefore, in the present embodiment, in the scope of experiment etc., change the parameter of each building block and they are combined, confirming the basis of stable oscillatory regime sets the design load of building block.

Alternatively, it is also possible to make the design load state closer to somewhat stable oscillation stationary vibration of the building block of composition oscillating circuit 7a.

By so, the oscillator signal Vo shown in Fig. 7 can be obtained under each state of (e) of (a)～Fig. 5 of Fig. 5.What be namely able to confirm that is, mounting surface 6 only exists sheet metal 8 or when sheet metal 8 is sandwiched between equipment E and mounting surface 6 or at equipment E when being placed around sheet metal 8, although can not be said to be vibration to stop, but the amplitude of oscillator signal Vo shows as significantly decaying.

It is output to testing circuit 7b from the oscillator signal Vo of oscillating circuit 7a output.When swinging the amplitude of signal Vo less than the reference value predetermined, testing circuit 7b is judged as that only placed sheet metal 8 or sheet metal 8 in mounting surface 6 is clamped or be placed in the mounting surface 6 near equipment E by equipment E, and output metal exists signal ST.Be there is signal ST and exports excitation control circuit 13 by testing circuit 7b (detection device of metal foreign body 7) in this metal.

On the contrary, when the amplitude of oscillator signal Vo is more than the reference value predetermined, testing circuit 7b (detection device of metal foreign body 7) be judged as in mounting surface 6 what all do not have placement or in mounting surface 6, only placed equipment E, do not export metal to excitation control circuit 13 and there is signal ST.

Excitation control circuit 13 is inputted be output constantly the excitation request signal RQ carrying out self-excitation request receiving circuit 11, receive the device authentication signal ID of circuit 12 and the metal from detection device of metal foreign body 7 from device authentication and there is signal ST.Be there is signal ST and exports systems control division 9 by excitation control circuit 13 in this excitation request signal RQ, device authentication signal ID and the metal that input constantly.And, there is signal ST by exporting excitation request signal RQ, device authentication signal ID and metal to systems control division 9 in excitation control circuit 13, waits the permission signal EN from systems control division 9.

Systems control division 9 when (1) have input excitation request signal RQ, (2) when have input device authentication signal ID, and the permission signal EN being used for the primary coil L1 being connected with supply module M is carried out excitation driving is exported excitation control circuit 13.Excitation control circuit 13, when being transfused to the permission signal EN from systems control division 9, drives and exports high frequency inverter circuit 14 by being used for primary coil L1 is carried out excitation with the drive control signal CT being powered.

Even if it addition, above-mentioned (1) (2) condition is set up, from detection device of metal foreign body 7 via excitation control circuit 13 systems control division 9 be have input metal there is signal ST time, systems control division 9 does not export permission signal EN yet.Thus, excitation control circuit 13 is not used for primary coil L1 is carried out the drive control signal CT of excitation driving to high frequency inverter circuit 14 output.

Further, when output allows not have during signal EN to input from least one signal in the excitation request signal RQ and device authentication signal ID of excitation control circuit 13, systems control division 9 stops output permission signal EN.Thus, in this case, excitation control circuit 13 does not also export drive control signal CT to high frequency inverter circuit 14.

High frequency inverter circuit 14 is connected with the primary coil L1 of supply module M.And, primary coil L1 is carried out excitation driving based on drive control signal CT by high frequency inverter circuit 14.

It is to say, when inputting drive control signal CT from excitation control circuit 13, primary coil L1 is carried out excitation and drives to be powered by high frequency inverter circuit 14.

Thus, can accept that the equipment E of power supply be placed in mounting surface 6 from electric supply installation 1 and when have sent device authentication signal ID and excitation request signal RQ from this equipment E and be absent from sheet metal 8 on mounting surface 6, the excitation carried out for powering drives to primary coil L1 by high frequency inverter circuit 14.That is, primary coil L1 carries out passing through non-contact power provides the excitation of secondary power to drive to equipment E.

As it is shown on figure 3, high frequency inverter circuit 14 possesses high-frequency oscillating circuits 14a and excitation circuit for generating synchronous signals 14b.High-frequency oscillating circuits 14a and primary coil L1 is connected to fetch and this primary coil L1 is carried out excitation driving.

Fig. 8 illustrates the circuit structure of high-frequency oscillating circuits 14a.

High-frequency oscillating circuits 14a is the local resonant circuit of semi-bridge type, is provided with bleeder circuit in parallel between the supply voltage G and the ground connection that are arranged at electric supply installation 1, and this bleeder circuit is made up of the series circuit of the 4th capacitor C4 and the five capacitor C5.The drive circuit being made up of the series circuit of the first power transistor Q11 and the second power transistor Q12 and this bleeder circuit are connected in parallel.It addition, in the present embodiment, the first power transistor Q11 and the second power transistor Q12 is made up of MOSFET, and the first power transistor Q11 and the second power transistor Q12 is connected to diode D1, D2 of afterflow respectively between source terminal and drain terminal.

And, between the junction point (node N1) and the junction point (node N2) of the first power transistor Q11 and the second power transistor Q12 of the 4th capacitor C4 and the five capacitor C5, it is connected to primary coil L1.It addition, the 6th capacitor C6 and primary coil L1 is connected in parallel.

In the present embodiment, first power transistor Q11 and the second power transistor Q12 is made up of N-channel MOS FET, the gate terminal of the first power transistor Q11 is connected to the first logical AND circuit 21, the gate terminal of the second power transistor Q12 is connected to the second logical AND circuit 22.

First logical AND circuit 21 is the logical AND circuit of dual input terminal, and one of them input terminal is inputted the first excitation synchronizing signal Vs1 as high and low signal.

In detail, the first excitation synchronizing signal Vs1 is the high and low signal with the cycle T s1 predetermined, as it is shown in figure 9, be set as shorter than low time tb1 by high time ta1.And, in the present embodiment, export this first excitation synchronizing signal Vs1 from the signal generating circuit (not shown) being arranged at systems control division 9.

It addition, another input terminal of the first logical AND circuit 21 is inputted the first output signal Vrs1 from the first logic or circuit 23.

First logic or circuit 23 are logic or the circuit of dual input terminal, and one of them input terminal is inputted the high signal Vst of the interval intermittently becoming high level as shown in Figure 10.

In detail, in the present embodiment, as shown in Figure 9 and Figure 10, the high signal Vst of interval has the cycle T st (=6Ts1) of 6 times of the cycle T s1 of the first excitation synchronizing signal Vs1.This interval high signal Vst the first excitation synchronizing signal Vs1 drop to from height low after rise to height, after rising to height second the first excitation synchronizing signal Vs1 be about to rise before drop to low.And, after after dropping to low level, the 5th the first excitation synchronizing signal Vs1 of output declines, the high signal Vst of next interval rises to height.At this, the time that the high signal Vst of interval is high level is called high time tx.

And, in the present embodiment, export the high signal Vst of this interval from the signal generating circuit (not shown) being arranged at systems control division 9.

It addition, another input terminal of the first logic or circuit 23 is inputted inverter control signal Vss as shown in Figure 10 and Figure 11 from excitation circuit for generating synchronous signals 14b.

When excitation circuit for generating synchronous signals 14b have input the drive control signal CT from excitation control circuit 13, excitation circuit for generating synchronous signals 14b drives the inverter control signal Vss of the high level to be powered to export the first logic or circuit 23 by being used for primary coil L1 is carried out excitation.

It addition, when excitation circuit for generating synchronous signals 14b not being inputted drive control signal CT from excitation control circuit 13, excitation circuit for generating synchronous signals 14b does not export the inverter control signal Vss of high level.

Such as, when not loading equipment E in mounting surface 6 (when being not received by excitation request signal RQ and device authentication signal ID), excitation circuit for generating synchronous signals 14b does not export the inverter control signal Vss of high level to the first logic or circuit 23.Now, high level time, by the cycle T st of the interval being input to one of them input terminal high signal Vst, is exported the first logical AND circuit 21 of next stage by the first logic or circuit 23 with high the first identical for time tx output signal Vrs1.In other words, now, the high signal Vst of interval is exported by the first logic or circuit 23 as the first output signal Vrs1.

Thus, as shown in Figure 10, when the first logical AND circuit 21 have input the high signal Vst of interval, the first excitation synchronizing signal Vs1 is exported the grid of the first power transistor Q11 by the first logical AND circuit 21 by cycle T st as the first ON-OFF signal Vg1.As a result of which it is, the first power transistor Q11 intermittently turns in response to the first ON-OFF signal Vg1 (the first excitation synchronizing signal Vs1) during the high time tx of the high signal Vst of interval by cycle T st.

Incidentally, when the condition not loading sheet metal 8 and above-mentioned (1) (2) is set up, excitation circuit for generating synchronous signals 14b is transfused to drive control signal CT, and the inverter control signal Vss of high level exports the first logic or circuit 23.And, the inverter control signal Vss of this high level is exported signal Vrs1 as first and exports the first logical AND circuit 21 of next stage by the first logic or circuit 23.

Thus, as shown in figure 11, during the first logical AND circuit 21 exports the inverter control signal Vss of high level, the first excitation synchronizing signal Vs1 exported of the cycle T s1 to predetermine is exported the grid of the first power transistor Q11 by the first logical AND circuit 21 as the first ON-OFF signal Vg1.As a result of which it is, the first power transistor Q11 carries out turning on, ending with the cycle T s1 of the first excitation synchronizing signal Vs1.

On the other hand, the gate terminal of the second power transistor Q12 is connected to the second logical AND circuit 22.Second logical AND circuit 22 is the logical AND circuit of dual input terminal, and one of them input terminal is inputted the second excitation synchronizing signal Vs2 as high and low signal.

In detail, the second excitation synchronizing signal Vs2 is the high and low signal with the cycle T s2 predetermined, as it is shown in figure 9, the second excitation synchronizing signal Vs2 has identical for the cycle T s1 cycle with the first excitation synchronizing signal Vs1.Additionally, in the same manner as the first excitation synchronizing signal Vs1, high time ta2 (=ta1) is set as shorter than low time tb2 (=tb1) by the second excitation synchronizing signal Vs2, and is in, with above-mentioned first excitation synchronizing signal Vs1, the relation substantially reversed.

That is, when the first excitation synchronizing signal Vs1 is high, the second excitation synchronizing signal Vs2 is low, and when the first excitation synchronizing signal Vs1 is low, the second excitation synchronizing signal Vs2 is height.

It addition, this, as it has been described above, be set as the first and second excitation synchronizing signal Vs1, Vs2 high time ta1, ta2 shorter than low time tb1, tb2.Thus, the first excitation synchronizing signal Vs1 drop to from height be low to moderate the second excitation synchronizing signal Vs2 from low rise to height till period and the second excitation synchronizing signal Vs2 drop to from height and to be low to moderate the first excitation synchronizing signal Vs1 from the low period risen to till height, there are the first and second excitation synchronizing signal Vs1, Vs2 is td low level idle time.By arranging this idle time of td, it is possible to realize the soft handover between the first power transistor Q11 and the second power transistor Q12.

It addition, in the present embodiment, this second excitation synchronizing signal Vs2 is exported from the signal generating circuit (not shown) being arranged at systems control division 9.

It addition, another input terminal of the second logical AND circuit 22 is inputted the second output signal Vrs2 from the second logic or circuit 24.

Second logic or circuit 24 are logic or the circuit of dual input terminal, and one of them input terminal is inputted the high signal Vst of above-mentioned interval.It addition, similarly another input terminal of the second logic or circuit 24 is inputted above-mentioned inverter control signal Vss from excitation circuit for generating synchronous signals 14b.

Thus, when excitation circuit for generating synchronous signals 14b being have input drive control signal CT from excitation control circuit 13 (when above-mentioned (1) (2) condition is set up), the inverter control signal Vss to the second logic or circuit 24 input high level.

Additionally, when excitation circuit for generating synchronous signals 14b not being inputted drive control signal CT from excitation control circuit 13 (when above-mentioned (1) (2) condition is false), the not inverter control signal Vss to the second logic or circuit 24 input high level.

And, high level time, by the cycle T st of the interval being input to one of them input terminal high signal Vst, is exported the second logical AND circuit 22 of next stage by the second logic or circuit 24 with high the second identical for time tx output signal Vrs2.In other words, now, the high signal Vst of interval is exported by the second logic or circuit 24 as the second output signal Vrs2.

Thus, when the second logical AND circuit 22 have input the high signal Vst of interval, as shown in Figure 10, the second excitation synchronizing signal Vs2 is exported the grid of the second power transistor Q12 by the second logical AND circuit 22 by cycle T st as the second ON-OFF signal Vg2.As a result of which it is, the second power transistor Q12 intermittently turns in response to the second ON-OFF signal Vg2 (the second excitation synchronizing signal Vs2) during the high time tx of the high signal Vst of interval by cycle T st.

Thus, such as, when not loading equipment E in mounting surface 6 (when being not received by excitation request signal RQ and device authentication signal ID), the first power transistor Q11 of high-frequency oscillating circuits 14a carries out turning on, ending according to the first excitation synchronizing signal Vs1 determined by the high signal Vst of interval, and the second power transistor Q12 carries out turning on, ending according to the second excitation synchronizing signal Vs2 determined by the high signal Vst of interval.

At this, the waveform of the first excitation synchronizing signal Vs1 and the waveform of the second excitation synchronizing signal Vs2 are in the relation of reversion, and therefore the first power transistor Q11 and the second power transistor Q12 alternately and intermittently carries out turning on, ending.Thus, primary coil L1 is driven by intermittently excitation.

Thus, mounting surface 6 does not load under the holding state of equipment E, the primary coil L1 of electric supply installation 1 is not by continuous excitation, but driven by intermittently excitation.

Incidentally, when not loading sheet metal 8 and above-mentioned (1) (2) condition sets up, the inverter control signal Vss of high level is exported the second logic or circuit 24 by excitation circuit for generating synchronous signals 14b.And, the inverter control signal Vss of this high level is exported signal Vrs2 as second and exports the second logical AND circuit 22 of next stage by the second logic or circuit 24.

Thus, during the inverter control signal Vss of output high level, the second excitation synchronizing signal Vs2 with the cycle T s2 predetermined is exported the grid of the second power transistor Q12 by the second logical AND circuit 22 as shown in Figure 11 as the second ON-OFF signal Vg2.As a result of which it is, the second power transistor Q12 carries out turning on, ending with the cycle T s2 of the second excitation synchronizing signal Vs2.

Thus, when not loading sheet metal 8 and above-mentioned (1) (2) condition sets up, namely during the inverter control signal Vss of output high level, first power transistor Q11 carries out turning on, ending according to the first excitation synchronizing signal Vs1, and the second power transistor Q12 turns on according to the second excitation synchronizing signal Vs2, ends.

At this, the first and second excitation synchronizing signal Vs1, the waveform of Vs2 that are output as first and second ON-OFF signal Vg1, Vg2 are in the relation mutually reversed.Therefore, during (1) (2) condition is set up, the first power transistor Q11 and the second power transistor Q12 of high-frequency oscillating circuits 14a are alternately turned on, end.

And, the first power transistor Q11 and the second power transistor Q12 produces excitation voltage VD1, VD2 respectively between source drain.

Thus, when equipment E being placed in the mounting surface 6 of electric supply installation 1 in order to be powered, the primary coil L1 being positioned at the position being placed with equipment E is driven by excitation continuously.

Systems control division 9 possesses pico computer, electrically connects with supply module M.As it has been described above, systems control division 9 is inputted excitation request signal RQ, device authentication signal ID and metal from excitation control circuit 13 there is signal ST.And, systems control division 9 is based on judging whether to have loaded the equipment E of request power supply from the excitation request signal RQ of excitation control circuit 13, device authentication signal ID.

When have input excitation request signal RQ and device authentication signal ID from excitation control circuit 13, excitation control circuit 13 output is allowed signal EN by systems control division 9.It is to say, systems control division 9 judges whether that the equipment E having loaded request power supply excitation control circuit 13 output is allowed signal EN.

It addition, systems control division 9 judges whether to have loaded sheet metal 8 in mounting surface 6 based on there is signal ST from detection device of metal foreign body 7 via the metal that excitation control circuit 13 exports.When from excitation control circuit 13 have input metal there is signal ST time, systems control division 9 to excitation control circuit 13 output allow signal EN.It is to say, systems control division 9 is judged as being placed with sheet metal 8 in mounting surface 6, excitation control circuit 13 output is not allowed signal EN.

Thus, even if the equipment E of request power supply is placed in the mounting surface 6 of electric supply installation 1 and electric supply installation 1 can be powered, when there are sheet metal 8 with the state shown in (d), (e) of Fig. 5 in mounting surface 6, systems control division 9 does not export permission signal EN yet.This is to prevent the sensing to sheet metal 8 from heating.

Systems control division 9 possesses the not shown signal generating circuit generating above-mentioned first excitation synchronizing signal Vs1, the second excitation synchronizing signal Vs2 and the high signal Vst of interval.When the on and off switch (not shown) of electric supply installation 1 is connected, systems control division 9 makes signal generating circuit drive and generates the first excitation synchronizing signal Vs1, the second excitation synchronizing signal Vs2 and the high signal Vst of interval.Then, the first excitation synchronizing signal Vs1, the second excitation synchronizing signal Vs2 that generate and the high signal Vst of interval are all exported the high frequency inverter circuit 14 of supply module M by systems control division 9.

Thus, do not input at supply module M under the state (such as holding state) allowing signal EN, the high frequency inverter circuit 14 of supply module M is continued to input the first excitation synchronizing signal Vs1, the second excitation synchronizing signal Vs2 and the high signal Vst of interval, and therefore the primary coil L1 of electric supply installation 1 not by continuous excitation but is driven by intermittently excitation.

Then, the effect of the electric supply installation 1 constituted as described above is illustrated.

Currently, when connecting not shown on and off switch and providing power supply to electric supply installation 1, high frequency inverter circuit 14 output is used for primary coil L1 carries out the first excitation synchronizing signal Vs1, the second excitation synchronizing signal Vs2 and the high signal Vst of interval that intermittently excitation drives by systems control division 9.

Thus, primary coil L1 is carried out intermittently excitation by the high frequency inverter circuit 14 of supply module M.Then, systems control division 9 waits excitation request signal RQ and device authentication signal ID from supply module M, until primary coil L1 persistently carrying out interval excitation from supply module M input excitation request signal RQ and device authentication signal ID systems control division 9.Now, supply module M is in holding state.

Soon, when placed equipment E, equipment E obtains fraction of secondary power by the interval excitation of the primary coil L1 of electric supply installation 1, makes equipment side transmitter/receiver circuit 10 action.Equipment E passes through equipment side transmitter/receiver circuit 10 forming apparatus in next life authentication signal ID and excitation request signal RQ, and is sent to the signal receiving antenna loop A T1 of supply module M via transmission/reception antennas loop A T3 by these signals.

Then, when signal receiving antenna loop A T1 receives device authentication signal ID and excitation request signal RQ from equipment E, excitation request receiving circuit 11 is utilized to extract excitation request signal RQ, utilize device authentication to receive circuit 12 extraction equipment authentication signal ID, these excitations request signal RQ and device authentication signal ID and be provided to systems control division 9 via excitation control circuit 13.

Systems control division 9 is judged as being placed with the equipment E of request power supply based on the excitation request signal RQ and device authentication signal ID from excitation control circuit 13, and excitation control circuit 13 output is allowed signal EN.

High frequency inverter circuit 14 (excitation circuit for generating synchronous signals 14b), in response to allowing signal EN, is exported drive control signal CT by excitation control circuit 13.Thus, from excitation circuit for generating synchronous signals 14b output inverter control signal Vss, start primary coil L1 is carried out continuous excitation.

In continuous excitation, systems control division 9 judges whether excitation request signal RQ disappears, when excitation request signal RQ does not disappear, persistently primary coil L1 is carried out continuous excitation.That is, to equipment E continued power.Thus, equipment E accepts non-contact power from electric supply installation 1, drives load Z by this energizing power.

At this, when taking off equipment E from mounting surface 6 or when excitation request signal RQ disappears, systems control division 9 is judged as that excitation request signal RQ disappears, stop supply module M output is allowed signal EN.

Then, systems control division 9 waits new excitation request signal RQ and device authentication signal ID from this supply module M, until inputting excitation request signal RQ and device authentication signal ID from supply module M primary coil L1 persistently carries out interval excitation.

It addition, play the period till disconnection when the not shown on and off switch from electric supply installation 1 is connected, detection device of metal foreign body 7 makes oscillating circuit 7a carry out oscillation action, carries out the detection of sheet metal 8.

Now, for oscillating circuit 7a, the design load of the building block of oscillating circuit 7a is configured to as following oscillating condition: this oscillating condition makes oscillating circuit 7a from immediately preceding not producing the ultimate value of vibration during beyond driving this oscillating circuit 7a and starting generation vibration in the scope the state after producing vibration is stablized near the state of the stable peak swing of this oscillating circuit 7a to amplitude of oscillation.

That is, change the value of building block, kind, when (a) such as Fig. 5 as shown in mounting surface 6 what all without load, vibrate finally start condition near setting oscillating condition.Now, as shown in the period A1 of Fig. 6, it is possible to realize the oscillator signal Vo of oscillating circuit 7a.

In other words, even if cause the electromagnetic property slight variations of metal detection aerial coil AT2, the amplitude also change of the oscillator signal Vo of oscillating circuit 7a due to sheet metal 8.

And, when only placed equipment E as shown in (c) such as Fig. 5, as shown in the period A2 of Fig. 6, the amplitude of the oscillator signal Vo of oscillating circuit 7a is decayed a little.

On the other hand, when only placed sheet metal 8 as shown in (b) such as Fig. 5, owing to sheet metal 8 causes that the electromagnetic property of metal detection aerial coil AT2 promptly changes, as shown in the period A3 of Fig. 6, the oscillation action of oscillating circuit 7a stops and stopping outputting oscillation signal Vo.

Similarly, as shown in (d) such as Fig. 5, sheet metal 8 is clamped by equipment E, or as shown in (e) such as Fig. 5 at equipment E when being placed around sheet metal 8, owing to sheet metal 8 causes that the electromagnetic property of metal detection aerial coil AT2 promptly changes, as shown in the period A4 of Fig. 6, the oscillation action of oscillating circuit 7a stops and stopping outputting oscillation signal Vo.

Thus, it is possible to detected the sheet metal 8 placed in the mounting surface 6 of electric supply installation 1 in high sensitivity by oscillating circuit 7a.

And, when detection device of metal foreign body 7 detect sheet metal 8 and export metal there is signal ST time, systems control division 9 receives metal via excitation control circuit 13 and there is signal ST, drive not shown notification light or notice buzzer to inform the user this meaning with the set time, and stop this supply module M output is allowed signal EN.

Afterwards, primary coil L1 is carried out intermittently excitation by systems control division 9, until metal exists signal ST and disappears.

Thus, in the present embodiment, it is prevented from sheet metal 8 by interval excitation and is inductively heated.

The contactless power supply system of present embodiment has the following advantages.

(1) in this embodiment, to the design load of the building block of oscillating circuit 7a, namely, transistor Q1, metal detection aerial coil AT2, the first～the 3rd capacitor C1～C3, first and second resistance R1, R2 design load be set so that do not producing the ultimate value of vibration in beyond this oscillating circuit 7a and start the state after producing vibration to amplitude of oscillation stable near the state at the stable peak swing place of this oscillating circuit 7a oscillating condition scope in produce to vibrate.

That is, the design load of oscillating circuit 7a is not able to maintain the value of persistent oscillation with stable amplitude, and is set to values below: to produce to vibrate from the oscillating condition in the oscillating condition that can vibrate after starting scope to before stable condition of sustained oscillation.As a result of which it is, the big change of amplitude of oscillation can be generated with the little change of the electromagnetic parameter relevant with vibration.

Thus, when when being placed around little or thin sheet metal 8 of metal detection aerial coil AT2, the presence or absence of the vibration of oscillating circuit 7a is impacted by the little change of the electromagnetic property of aerial coil AT2, is transformed to the big change of the amplitude of oscillation of oscillator signal Vo.Thus, detection device of metal foreign body 7 (oscillating circuit 7a) is highly sensitive, it is possible to detect less sheet metal 8.

(2) in this embodiment, detection device of metal foreign body 7 is arranged at electric supply installation 1, therefore, it is possible to the sheet metal 8 individually detecting the mounting surface 6 being placed on electric supply installation 1 in electric supply installation 1 side, the sheet metal 8 that is sandwiched between equipment E and mounting surface 6.Thereby, it is possible to the detection based on sheet metal 8 controls power supply.

(3) in this embodiment, will be formed in the metal detection aerial coil AT2 of the mounting surface 6 of electric supply installation 1 and be formed as spiral-shaped.By being formed as spiral-shaped, it is possible to make loop A T2 launch in the direction, face of mounting surface 6, additionally can also make its lower thickness.Simply form it addition, printed wiring etc. can be passed through, therefore can also be formed on the two sides of top board 5, and also can make generally circular in shape, square etc. variously-shaped.

(4) in this embodiment, metal detection aerial coil AT2 is set to constitute the parts of the oscillating circuit 7a of detection device of metal foreign body 7, therefore, it is possible to realize the minimizing of building block.

(5) in this embodiment, the mounting surface 6 of top board 5 is formed with metal detection aerial coil AT2.That is, metal detection aerial coil AT2 it is being formed with closest to the position of sheet metal 8.Thereby, it is possible to metal detection sensitivity is risen to higher precision.

(the second embodiment)

Then, according to Figure 12, Figure 13, Figure 14, the second embodiment is described.

In the electric supply installation 1 of above-mentioned first embodiment, the metal detection aerial coil AT2 being arranged at electric supply installation 1 is one.In the present embodiment, there is following characteristics point: in electric supply installation 1, be provided with multiple metal detection aerial coil AT2.

It addition, for the ease of illustrating, the part identical with the first embodiment is added identical labelling and omits detailed description.

In fig. 12, the mounting surface 6 of electric supply installation 1 is formed with multiple (being 20 in fig. 12) metal detection aerial coil AT2.The size of the metal detection aerial coil AT2 of present embodiment is 1st/20th of the metal detection aerial coil AT2 of the first embodiment, for mounting surface 6,5 metal detection aerial coil AT2 of arrangement, in the Y direction 4 metal detection aerial coil AT2 of arrangement in the X direction.And, each metal detection aerial coil AT2 is formed as spiral-shaped, utilizes known printed wiring technology to be formed in mounting surface 6.

Each metal detection aerial coil AT2 is connected with the detection device of metal foreign body 7 being arranged in housing 2.And, as shown in figure 13, the sheet metal 8 being positioned over mounting surface 6 is detected by detection device of metal foreign body 7 by each metal detection aerial coil AT2.

Detection device of metal foreign body 7 includes oscillating circuit 7a and testing circuit 7b.In the same manner as the first embodiment, oscillating circuit 7a is made up of Colpitis oscillating circuit.And, as shown in figure 14, each metal detection aerial coil AT2 is connected in parallel, and this parallel circuit is connected with oscillating circuit 7a.

And, first embodiment is similarly, for with multiple metal detection aerial coil AT2 oscillating circuit 7a being connected, the design load of building block constituting oscillating circuit 7a is set so that from do not produce in time exceeding and drive this oscillating circuit 7a vibration ultimate value and start the state after producing vibration play amplitude of oscillation stable near the state of the stable peak swing of this oscillating circuit 7a till oscillating condition scope in produce vibration.

It addition, when only placed equipment E as shown in (c) such as Fig. 5, as shown in the period A2 of Fig. 6, the amplitude of the oscillator signal Vo of oscillating circuit 7a is decayed a little.

Similarly, as shown in (d) such as Fig. 5, sheet metal 8 is clamped by equipment E or as shown in (e) such as Fig. 5 at equipment E when being placed around sheet metal 8, also due to sheet metal 8 and cause that the electromagnetic property of metal detection aerial coil AT2 promptly changes, as shown in the period A4 of Fig. 6, the oscillation action of oscillating circuit 7a stops and stopping outputting oscillation signal Vo.

Present embodiment, except having the advantage of the first embodiment, has further the advantage that.

(1) in this embodiment, metal detection aerial coil AT2 is made up of the aerial coil of multiple little areas.It is to say, be configured with the metal detection aerial coil AT2 of multiple little area in the mounting surface 6 of same widths.Thus, resolution improves, it is possible to detect less sheet metal 8.

It addition, an oscillating circuit 7a to be connected in parallel multiple metal detection aerial coil AT2, it is possible to suppress the decline of detection sensitivity.Therefore, it is possible to utilize an oscillating circuit 7a to detect little sheet metal 8 while guaranteeing large-area detection region.

Further, owing to utilizing an oscillating circuit 7a just can carry out large-area detection, therefore, it is possible to save electric power, save parts.Further, by configure multiple oscillating circuit 7a can expand simply detection region, it is possible to tackling wide power supply face freely, above-mentioned each oscillating circuit 7a is respectively provided with multiple this aerial coil AT2.

It addition, in this embodiment, multiple metal detection aerial coil AT2 are connected in parallel, this parallel circuit and an oscillating circuit 7a are connected.As shown in Figure 15, multiple metal detection aerial coil AT2 can also be divided into multiple groups, each group is arranged detection device of metal foreign body 7 (an oscillating circuit 7a and a testing circuit 7b).In this case, for each group, it is also possible to the multiple metal detection aerial coil AT2 belonging to this group are connected in parallel, and this parallel circuit is connected with the oscillating circuit 7a of this group.

It is to say, by the group (that is, detection device of metal foreign body 7) arranging multiple oscillating circuit 7a and testing circuit 7b, it is possible to easily expand detection region, it is possible to tackle wide mounting surface 6 freely.

(the 3rd embodiment)

Then, according to Figure 16, Figure 17, the 3rd embodiment is described.

In above-mentioned first and second embodiments, detection device of metal foreign body 7 is arranged at electric supply installation 1.In the present embodiment, there is following characteristics point: detection device of metal foreign body 7 is arranged at equipment E.

In figure 16, the electric power receiving surface that namely lower surface of the housing of equipment E abuts against is formed with multiple (being 4 in this embodiment) metal detection aerial coil AT2 with the mounting surface 6 of electric supply installation 1.In the same manner as the first and second embodiments, each metal detection aerial coil AT2 is formed as spiral-shaped, utilizes known printed wiring technology to be formed at lower surface.And, in the present embodiment, the mounting surface 6 at electric supply installation 1 is formed without metal detection aerial coil AT2.

It addition, be provided with the detection device of metal foreign body 7 including oscillating circuit 7a and testing circuit 7b in equipment E.And, being formed and be connected in parallel at multiple metal detection aerial coil AT2 of the lower surface of equipment E, this parallel circuit is connected with the oscillating circuit 7a of detection device of metal foreign body 7.These multiple metal detection aerial coil AT2 constitute a part for detection device of metal foreign body 7.And, the sheet metal 8 being sandwiched between mounting surface 6 and the equipment E being placed in mounting surface 6 is detected by detection device of metal foreign body 7 by metal detection aerial coil AT2.

In the same manner as the first embodiment, the oscillating circuit 7a of detection device of metal foreign body 7 is made up of Colpitis oscillating circuit.And, in the same manner as the first embodiment, for oscillating circuit 7a, the design load of building block constituting oscillating circuit 7a is set so that from do not produce in time exceeding and drive this oscillating circuit 7a vibration ultimate value and start the state after producing vibration play amplitude of oscillation stable near the state of the stable peak swing of this oscillating circuit 7a till oscillating condition scope in vibrate.

Thus, the mounting surface 6 of electric supply installation 1 is placed with equipment E and sheet metal 8 are clamped by this equipment E or when when being placed around sheet metal 8 of this equipment E, owing to sheet metal 8 causes that the electromagnetic property of metal detection aerial coil AT2 promptly changes, the oscillation action that can make oscillating circuit 7a stops, and stops outputting oscillation signal Vo.

It is output to testing circuit 7b from the oscillator signal Vo of oscillating circuit 7a output.When the amplitude of oscillator signal Vo is less than the reference value predetermined, testing circuit 7b be judged as sheet metal 8 clamped by equipment E or equipment E in mounting surface 6 be placed around sheet metal 8, there is signal ST in output metal.

On the contrary, when the amplitude of oscillator signal Vo is more than the reference value predetermined, testing circuit 7b is judged as only being placed with equipment E in mounting surface 6, does not export metal and there is signal ST.

Be there is signal ST and exports equipment side transmitter/receiver circuit 10 by testing circuit 7b in this metal.And, be there is signal ST and is sent to electric supply installation 1 via transmission/reception antennas loop A T3 by equipment side transmitter/receiver circuit 10 in the metal of input.

It addition, the DC source B of oscillating circuit 7a is the accessory power supply (secondary cell) being built in equipment E.When carrying out the mounting surface 6 of electric supply installation 1 of interval excitation is placed with equipment E, by the secondary power produced in secondary coil L2, this accessory power supply (secondary cell) is charged.Thus, when when carrying out the mounting surface 6 of electric supply installation 1 of interval excitation is placed with equipment E and by the secondary power produced in secondary coil L2, accessory power supply (secondary cell) is charged, equipment side transmitter/receiver circuit 10 is driven, and oscillating circuit 7a also begins to carry out oscillation action.

On the other hand, in the supply module M of electric supply installation 1, it is provided with metal signal receives circuit 7c.Metal signal receives the signal receiving antenna loop A T1 of circuit 7c and supply module M and is connected.Metal signal receives circuit 7c and receives from the equipment E the being placed in mounting surface 6 transmission signal sent, and extracts metal and there is signal ST from this transmission signal received.Then, metal signal receive circuit 7c from send signal extraction go out metal there is signal ST time, be there is signal ST in this metal and exports excitation control circuit 13.

Be there is signal ST and exports systems control division 9 by excitation control circuit 13 in metal.When have input metal and there is signal ST, systems control division 9 does not export permission signal EN.Thus, excitation control circuit 13 does not drive the drive control signal CT to be powered to high frequency inverter circuit 14 output for primary coil L1 carries out excitation.

This embodiment presents the advantage that.

(1) in this embodiment, in equipment E, detection device of metal foreign body 7 it is provided with.And, the design load of the building block of the oscillating circuit 7a being arranged in equipment E is not able to stable amplitude to maintain the value of persistent oscillation, and is set at values below: this value is the value to produce vibration from the oscillating condition in the oscillating condition scope to before stable condition of sustained oscillation after can starting vibration.Thereby, it is possible to generate the big change of amplitude of oscillation with the little change of the electromagnetic parameter relevant with vibration.

Thus, when when being placed around little or thin sheet metal 8 of metal detection aerial coil AT2, the presence or absence of the vibration of oscillating circuit 7a is impacted by the little change of the electromagnetic property of aerial coil AT2, is transformed to the big change of the amplitude of oscillation of oscillator signal Vo.Thus, detection device of metal foreign body 7 (oscillating circuit 7a) becomes high sensitivity, it is possible to detect less sheet metal 8.

(2) in this embodiment, detection device of metal foreign body 7 is arranged in equipment E.Thus, equipment E has detection function, therefore, it is possible to make attachment or be placed on the sheet metal 8 near equipment E or accuracy of detection that the sheet metal 8 that is sandwiched between electric supply installation and equipment E detects improves further.

(3) in this embodiment, it is formed with metal detection aerial coil AT2 at the lower surface of the housing of equipment E.That is, when equipment E is placed in mounting surface 6, metal detection aerial coil AT2 it is being formed with closest to the position of sheet metal 8.Thereby, it is possible to metal detection sensitivity is risen to higher precision.

(the 4th embodiment)

Then, according to Figure 18, Figure 19, Figure 20, Figure 21, the 4th embodiment is described.

In above-mentioned first and second embodiments, detection device of metal foreign body 7 is arranged at electric supply installation 1, in the third embodiment, detection device of metal foreign body 7 is arranged at equipment E.In the present embodiment, there is following characteristics point: by detection device of metal foreign body 7 scattering device in electric supply installation 1 and equipment E.

In figure 18, the lower surface of the housing of equipment E, the electric power receiving surface that namely abuts against with the mounting surface 6 of electric supply installation 1 are formed with multiple (being 4 in this embodiment) metal detection aerial coil AT2.In the same manner as the 3rd embodiment, each metal detection aerial coil AT2 is formed as spiral-shaped, utilizes known printed wiring technology to form the lower surface of the housing at equipment E.Metal detection aerial coil AT2 is connected in parallel, and this parallel circuit is connected with the oscillating circuit 7a constituting detection device of metal foreign body 7 being arranged in equipment E.

In the same manner as the 3rd embodiment, the oscillating circuit 7a shown in Figure 19 is made up of Colpitis oscillating circuit.And, in the same manner as the 3rd embodiment, for with the metal detection aerial coil AT2 oscillating circuit 7a being connected, the design load of building block constituting oscillating circuit 7a is set so that from do not produce in time exceeding and drive this oscillating circuit 7a vibration ultimate value and start the state after producing vibration play amplitude of oscillation stable near the state of the stable peak swing of this oscillating circuit 7a till oscillating condition scope in vibrate.

It addition, when the oscillation action of oscillating circuit 7a stops, equipment side transmitter/receiver circuit 10 stops sending device authentication signal ID.

It addition, the DC source B of oscillating circuit 7a is the accessory power supply (secondary cell) being built in equipment E.When carrying out the mounting surface 6 of electric supply installation 1 of interval excitation is placed with equipment E, by the secondary power produced in secondary coil L2, this accessory power supply (secondary cell) is charged.Additionally, accessory power supply can also be the electrical storage devices such as capacitor.Thus, when when carrying out the mounting surface 6 of electric supply installation 1 of interval excitation is placed with equipment E and by the secondary power produced in secondary coil L2, accessory power supply (secondary cell) is charged, equipment side transmitter/receiver circuit 10 is driven, and oscillating circuit 7a also begins to carry out oscillation action.Now, the interval excitation of equipment side transmitter/receiver circuit 10 and oscillating circuit 7a and primary coil L1 synchronously carries out intermitten, until completing accessory power supply (secondary cell) is charged.

On the other hand, the mounting surface 6 of electric supply installation 1 is formed with multiple (being 20 in figure 18) receiving antenna coil AT4.About the receiving antenna coil AT4 of present embodiment, for mounting surface 6, arrange 5 in the X direction and arrange 4 in the Y direction.And, each receiving antenna coil AT4 is formed as spiral-shaped, utilizes known printed wiring technology to be formed at mounting surface 6.Receiving antenna coil AT4 is connected with the testing circuit 7b constituting detection device of metal foreign body 7 being arranged in electric supply installation 1 (housing 2).

The each metal detection aerial coil AT2 being formed at the equipment E being placed in mounting surface 6 flux change discharged is detected by each receiving antenna coil AT4, and the detection signal of the voltage waveform corresponding with this flux change is exported testing circuit 7b.

It is to say, when equipment E being placed on mounting surface 6 and sheet metal 8 is clamped by equipment E or at equipment E when being placed around sheet metal 8, oscillating circuit 7a stops oscillation, or the amplitude of oscillator signal Vo decays to the amplitude close to zero.Flux change from this metal detection aerial coil AT2 is detected by receiving antenna coil AT4, and the detection signal of the amplitude less than setting is exported testing circuit 7b.As a result of which it is, testing circuit 7b detects whether there is sheet metal 8 according to the amplitude level of the detection signal received by receiving antenna coil AT4, export metal and there is signal ST.

At this, between electric supply installation 1 and equipment E, it is considered to the state shown in Figure 20 (a)～(g).

(a) of Figure 20 represents what is all without the state placed in the mounting surface 6 of electric supply installation 1.

(b) of Figure 20 represents the state that only placed sheet metal 8 in the mounting surface 6 of electric supply installation 1.

(c) of Figure 20 represents the state that only placed equipment E in the mounting surface 6 of electric supply installation 1.

(d) of Figure 20 represents the state having sandwiched sheet metal 8 between the mounting surface 6 and equipment E of electric supply installation 1.

(e) of Figure 20 represents the state that placed sheet metal 8 in the mounting surface 6 of electric supply installation 1 away from the position of equipment E.

(f) of Figure 20 represents that the mounting surface 6 of electric supply installation 1 and equipment E are separated the state being powered.

(g) of Figure 20 represents and the mounting surface 6 of electric supply installation 1 is separated with sheet metal 8, this isolated space or near also placed the state of sheet metal 8.

Under this each state, as shown in (a) such as Figure 20, in mounting surface 6, what does not all have placement, as shown in the period A1 of Figure 21, equipment side transmitter/receiver circuit 10 and oscillating circuit 7a do not receive the secondary power from secondary coil L2, therefore equipment side transmitter/receiver circuit 10 does not send device authentication signal ID, and oscillating circuit 7a does not vibrate.As a result of which it is, the terminal voltage of metal detection aerial coil AT2 and receiving antenna coil AT4 is zero.Further, since do not send device authentication signal ID from equipment E, therefore electric supply installation 1 (primary coil L1) carries out intermittent excitation.

Additionally, when only placed sheet metal 8 in the mounting surface 6 of electric supply installation 1 as shown in (b) such as Figure 20, as shown in the period A3 of Figure 21, equipment side transmitter/receiver circuit 10 and oscillating circuit 7a do not receive the secondary power from secondary coil L2, therefore equipment side transmitter/receiver circuit 10 does not send device authentication signal ID, and oscillating circuit 7a does not vibrate.As a result of which it is, the terminal voltage of metal detection aerial coil AT2 and receiving antenna coil AT4 is zero.Further, since do not send device authentication signal ID from equipment E, therefore electric supply installation 1 (primary coil L1) takes place without the interval excitation that sheet metal 8 carries out sensing this degree of heating.

And, when only placed equipment E in the mounting surface 6 of electric supply installation 1 as shown in (c) such as Figure 20, as shown in the period A2 of Figure 21, equipment side transmitter/receiver circuit 10 and oscillating circuit 7a receive the secondary power from secondary coil L2, equipment E (equipment side transmitter/receiver circuit 10) sends device authentication signal ID, and oscillating circuit 7a carries out the persistent oscillation of peak swing.

As a result of which it is, the terminal voltage of the receiving antenna coil AT4 of electric supply installation 1 also becomes the continuous oscillation signal of peak swing.As a result of which it is, do not generate metal there is signal ST, electric supply installation 1 (primary coil L1) is also carried out continuous excitation.

Additionally, it is being separated when being powered in the mounting surface 6 of electric supply installation 1 and equipment E as shown in Figure 20 (f), as shown in the period A5 of Figure 21, equipment side transmitter/receiver circuit 10 and oscillating circuit 7a receive the secondary power from secondary coil L2, equipment E (equipment side transmitter/receiver circuit 10) sends device authentication signal ID, and oscillating circuit 7a carries out the continuous oscillation of peak swing.

Although as a result of which it is, amplitude diminishes, but the terminal voltage of the receiving antenna coil AT4 of electric supply installation 1 still becomes continuous oscillation signal.As a result of which it is, do not generate metal there is signal ST, electric supply installation 1 (primary coil L1) is also carried out continuous excitation.

Additionally, when having sandwiched sheet metal 8 between the mounting surface 6 of electric supply installation 1 and equipment E as shown in (d) such as Figure 20, as shown in the period A6 of Figure 21, although intermittently sending device authentication signal ID from equipment E, but the oscillator signal Vo of oscillating circuit 7a carrying out intermittent oscillation with the amplitude close to zero or stops oscillation.(e) of Figure 20 is too.

As a result of which it is, generate metal there is signal ST, electric supply installation 1 (primary coil L1) takes place without the interval excitation that sheet metal 8 carries out sensing this degree of heating.

Additionally, as shown in (g) such as Figure 20, the mounting surface 6 of electric supply installation 1 is separated with sheet metal 8 and in this space separated or when being placed around sheet metal 8, also as shown in the period A6 of Figure 21, although intermittently sending device authentication signal ID from equipment E, but the oscillator signal Vo of oscillating circuit 7a also carrying out intermittent oscillation with the amplitude close to zero or stops oscillation.Further, since the sheet metal 8 sandwiched and cause that the electromagnetic wave from metal detection aerial coil AT2 is absorbed, and the terminal voltage of the receiving antenna coil AT4 that the flux change from this metal detection aerial coil AT2 detects is decayed.

This embodiment presents the advantage that.

(1) according to this embodiment, detection device of metal foreign body 7 is constituted by arranging metal detection aerial coil AT2 and oscillating circuit 7a in equipment E, arranging receiving antenna coil AT4 and testing circuit 7b in electric supply installation 1.It is to say, by detection device of metal foreign body 7 separate configuration in electric supply installation 1 and equipment E.

Thus, for whether there is the metallic foreign body being powered folded by device 1 and equipment E, owing to the decay of the magnetic flux of the receiving antenna coil AT4 being transferred to be arranged at electric supply installation 1 can also be utilized except stopping except the oscillating circuit of equipment side or decay, therefore, it is possible to the sheet metal 8 that detection is less.

It addition, as magnetic resonance formula, secondary coil L2, there is the way of electromagnetic induction of resonance circuit in secondary coil L2 in several cm～tens more than cm space being powered powers, also be able to application at primary coil L1 and secondary coil L2.

It addition, above-mentioned embodiment can also change as follows.

In the respective embodiments described above, utilize Colpitis oscillating circuit to constitute the oscillating circuit 7a of detection device of metal foreign body 7, but be not limited to this, for instance other oscillating circuits such as Ha Tuoli oscillating circuit can also be utilized to implement.

In the respective embodiments described above, spiral helicine metal detection aerial coil AT2 is shaped so as to square, but is not limited to this, for instance, it is also possible to implement with other shape such as circular, oval.

In the respective embodiments described above, the frequency of oscillation of the oscillating circuit 7a of detection device of metal foreign body 7 is not defined especially.The frequency of oscillation of oscillating circuit 7a (oscillator signal Vo) can also being set as, comparison primary coil L1 carries out the frequency of oscillation height of the excitation high frequency inverter circuit 14 (high-frequency oscillating circuits 14a) to be powered.

So, by making the frequency ratio that metal detection aerial coil AT2 carries out excitation that primary coil L1 to carry out the frequency height of excitation, the impact of the magnetic flux of primary coil L1 is reduced, it is possible to increase accuracy of detection.It addition, according to this structure, it is possible to reduce the volume number of metal detection aerial coil AT2 or shorten the length of coil.

In above-mentioned first embodiment and the second embodiment, the mounting surface 6 of electric supply installation 1 is formed metal detection aerial coil AT2, in housing 2, is provided with the oscillating circuit 7a and testing circuit 7b that constitute detection device of metal foreign body 7.As shown in figure 22, formed and form spiral helicine metal detection aerial coil AT2 on the surface of the flexible substrate 30 (can also be thin hard substrate) of thin insulating properties and the independent detection device of metal foreign body 7 of oscillating circuit 7a and testing circuit 7b is installed in the side, surface of flexible substrate 30.And, detection device of metal foreign body 7 connects up, this wiring can be connected with the holding wire of electric supply installation 1 and power line.

By the detection device of metal foreign body so constituted 7 is positioned in the mounting surface of existing electric supply installation, it is possible to make existing electric supply installation become the contactless power supply system with metal-detecting function.

Additionally, spiral helicine receiving antenna coil AT4 is formed on the surface of the flexible substrate (can also be thin hard substrate) of thin insulating properties, at side, the surface mounting testing circuit 7b of this substrate and connect up, wherein, the testing circuit 7b holding wire with existing electric supply installation 1 and power line can be connected by this wiring.

And, by by this substrate-placing in the mounting surface of existing electric supply installation, it is possible to make existing electric supply installation become the contactless power supply system with the metal-detecting function identical with the 4th embodiment.

In the respective embodiments described above, testing circuit 7b judges the presence or absence of sheet metal 8 according to the size of the amplitude of oscillator signal Vo, but testing circuit 7b can also judge the presence or absence of sheet metal 8 according to the change of frequency.In this case, design load for the building block of oscillating circuit 7a, it is not able to maintain the design load carrying out persistent oscillation with stable frequency of oscillation, and the value till being set at playing from frequency unsure state before the condition of sustained oscillation of stable oscillation stationary vibration frequency.In addition, it is desirable to generate the big change of frequency of oscillation with the little change of the electromagnetic parameter relevant with vibration.

In above-mentioned first～the 3rd each embodiment, any one in electric supply installation 1 and equipment E is formed metal detection aerial coil AT2, is provided with oscillating circuit 7a and testing circuit 7b the side being formed with metal detection aerial coil AT2.Metal detection aerial coil AT2 can also be formed in electric supply installation 1 and equipment E two side and oscillating circuit 7a and testing circuit 7b is set implements.In this case, it is possible to carry out more fine high-precision detection.

In the respective embodiments described above, metal detection aerial coil AT2 is set to helical form but it also may formed by other shape such as ring-type, helical form.

Claims

1. a contactless power supply system, it is characterised in that possess:

Electric supply installation, it includes primary coil and makes the high-frequency inverter having high frequency electric to flow in above-mentioned primary coil；

Equipment, it includes secondary coil, and the alternating magnetic field that this secondary coil is produced by the electric current owing to flowing in above-mentioned primary coil produces induction electromotive force, and load is provided electric power by the electromotive force that this equipment utilization produces in above-mentioned secondary coil；And

Detection device of metal foreign body, comprising:

Metal detection aerial coil, it is arranged at the said equipment；

Oscillating circuit, it is arranged at the said equipment, and this oscillating circuit makes have high frequency electric to flow in above-mentioned metal detection aerial coil；

Receiving antenna coil, it is arranged at above-mentioned electric supply installation, the change of the magnetic flux that the detection of this receiving antenna coil is produced by above-mentioned metal detection aerial coil；And

Testing circuit, it is arranged at above-mentioned electric supply installation, and this testing circuit receives the detection signal from above-mentioned receiving antenna coil,

Wherein, above-mentioned oscillating circuit includes the building block with following design load: this design load makes to produce under above-mentioned oscillating circuit oscillating condition in following scope vibration, this scope is from starting the scope to before stable condition of sustained oscillation of the oscillating condition after generation is vibrated immediately preceding this oscillating circuit

Above-mentioned detection device of metal foreign body utilizes above-mentioned testing circuit, the change of the electrical characteristic according to the above-mentioned metal detection aerial coil caused by the metallic foreign body being placed on above-mentioned electric supply installation, the stopping of vibration or the decay of amplitude of oscillation to above-mentioned oscillating circuit detect, control above-mentioned electric supply installation

Above-mentioned oscillating circuit makes vibration stop or making the amplitude of vibration decay when there is metallic foreign body on above-mentioned electric supply installation, vibrate with maximum amplitude when being absent from whatever on above-mentioned electric supply installation,

Above-mentioned secondary coil is housed in the housing of the said equipment,

Above-mentioned metal detection aerial coil is configured at the electric power receiving surface formed by the housing of the said equipment,

The mounting surface for loading the said equipment of above-mentioned electric power receiving surface and above-mentioned electric supply installation in opposite directions,

Above-mentioned primary coil is housed in the housing of above-mentioned electric supply installation,

Above-mentioned receiving antenna coil is configured at the above-mentioned mounting surface of above-mentioned electric supply installation.

2. contactless power supply system according to claim 1, it is characterised in that

Above-mentioned metal detection aerial coil is the parts constituting above-mentioned oscillating circuit.

3. contactless power supply system according to claim 1 and 2, it is characterised in that

Above-mentioned metal detection aerial coil is made up of the coil of multiple little areas.

4. contactless power supply system according to claim 3, it is characterised in that

Above-mentioned metal detection aerial coil is to be connected by the coils from parallel connection of coils of above-mentioned multiple little areas and constitute.

5. contactless power supply system according to claim 1 and 2, it is characterised in that

The frequency of oscillation of above-mentioned oscillating circuit is higher than the frequency of oscillation of above-mentioned high-frequency inverter.

6. contactless power supply system according to claim 1 and 2, it is characterised in that

Above-mentioned metal detection aerial coil is formed as helical form.

7. the detection device of metal foreign body of a contactless power supply system, the primary coil of electric supply installation is carried out excitation by this contactless power supply system, the secondary coil being made the equipment being arranged on above-mentioned electric supply installation by electromagnetic induction produces induction electromotive force, this induction electromotive force is supplied to the load of the said equipment, the detection device of metal foreign body of this contactless power supply system is characterised by possessing:

Metal detection aerial coil, it is arranged at the said equipment；

Oscillating circuit, it is arranged at the said equipment, and this oscillating circuit makes have high frequency electric to flow in above-mentioned metal detection aerial coil,

The change according to the electrical characteristic of the above-mentioned metal detection aerial coil caused by the metallic foreign body being placed on above-mentioned electric supply installation of the above-mentioned testing circuit, the stopping of vibration or the decay of amplitude of oscillation to above-mentioned oscillating circuit detect, control above-mentioned electric supply installation

Above-mentioned secondary coil is housed in the housing of the said equipment,